Telephone system



Feb. 11, 1930 H. VON BECKERATH 1,746,327

TELEPHONE SYSTEM Filed Feb. 27, 1928 6 g i E 179 H' Q M WL/ lg I5 Wi Hans Unn BEGk Efi Th Patented Feb. 1930 HANS VON BEGKERATH, OI BERLIN-CHARLOTTENBURG, GERMANY, ASSIGNOB TO SIE- MEN'S db HALSKE AKTIENGESELLSCHAIT,

NEAR BERLIN, GERMANY WERNEBWERK, OF SIEMENSSTAD'I,

TELEPHONE SYS'JJII'JIII,

Application filed February 27, 1928, Serial No. 2 5 7,173, and in Germany June 18, 1927.

The invention relates to provisions for .receiving current impulses, especially formutomatic and semi-automatic telephone sys tems. 0 ensure reliable service and especially the reliable operation of the switches in'such systems, it is of primary importance that the impulse receiving and impulse repeating re- 7 lays operate perfectly. A .very sensitive impulse repeating relay .isessential for the im pulse transmissio'irover'long trunk lines in order to reach great distances.

Now the objectof the invention is to furiiish a highly sensitive relay,iwhich with very simple construction gives very. reliable servture of the impulse receiving relay to'its normal position by means of an auxiliary winding which is momentarily energized after an impulse has been received or retransmitted. Examples of the invention are shown in the drawing. 7

Figure 1 shows a possible .the relay, while the Figures 2 and 3 show diagrammatically the circuits of this relay in connection with an impulse repeater.

These examples are based on a relay, which is brought into the operated position by one or more alternating current windings and is restored to its normal position by a direct current winding. In the circuit diagrams,

- tlieielays have been shown separated from their contacts and placed wherever it was found convenient in view of their functions.

The relays and operating magnets are designated by capital letters and their contacts by corresponding small letters and numerals.

-The entire equipment is shown in normal or resting position. Details of operation will be explained in the following description.

In Figure 1, the angular piece 1 is made of non-magnetic material such asbrasspit serves to support the cores2 and3 of the alternating and direct current windings and to carry the contact spring 4. The relay is provided with two alternatin current windings 5 and 6, which are mount on a common core 2,and with a direct current winding 7,, which is wound on-the core 3 which is magnetically separated from the core 2. The two cores 2 construction of position. by its own,

come any spring tension, so that, it can be 'brought'into its operated position 'b comparatively weak currents'in the win 'ngs 5 and 6. .On the cessation of the current flowing through the windings 5 and 6, the direct current winding 7 is energized in a locaLcircuit in a manner explained hereafter-with reference to the Figs. 2 and 3, and this wind ing restores the armature8 to its normal position. V

The method of operating the circuit ar rangement shown in the Figure 2 will now be described in detail. This figure shows the circuit ofa repeater of impulse and speech currents; it is located at the incoming end of a trunk line between two exchanges. The windings I W and II WV correspond to the windings 5 and 6 of Figure 1, whilethe nating current relay W over the repeater Ue. These windings I and II are in series with condensers C1 and C2 and are bridged across the outgoing talking conductors from the secondary windings of the repeater Ue. The relay W at its contact 10 'w closes a circuit over the contact 11 g for the winding of the relay H. At contact 12 k a locking circuit is established for the relay H, while at con tact '13 It the following circuit is closed for the relay M: ground, contacts 13 h, 14 q,- winding of the relay M and parallel thereto resistance '1' to-battery. .The relay M over itscontact 15 m energizes the winding of the relay Q and at contact 16 m it bridges the contact 11 g inthe locking circuit of pulse is ended. When the relay H falls back,

its contact 12 h interrupts the circuit of the relay Q, which opens the contact 17 g and thus removes the short circuit from the high ohmic resistance Ti 2. Thereupon the winding G of the impulse receiving relay only receives a weak current, which sufiices to retain the armature of the relay in its normal position. It should also be mentioned that the received current impulse is transmitted to the succeeding switches over the contacts 18 h and 19 h and over the conductors a and b of the outgoing trunk line.

The circuit shown in Figure 3 only diflers from that of the Figure 2 in that the impulse receiving relay has two direct current windings and is therefore differently connected up. With the arrangement in its normal condition, there is the following circuit for the direct current windings: battery, high ohmic resistance We 3, winding I Grv 1, lower half of the secondary windin of the repeater U6 .1, ground, and parallel t ereto: contact 20 q,

winding II 1, upper half of the secondary winding of therepeater Ue 1, ground. The windings I G 1 and II G 1 are wound in opposite directions on the common core and are so adjusted that there is only a weak resulting field, which is required to keep the armature in the normal position. If an impulse of current arrives over the junction line, the alternating current windings I W 1 and II W 1 are ener ized. When the relay Q, is operated (as in ig. 2) it opens the contact 20 9 while over the contact 21 g the low resistance Wz' 4 is placed in parallel with the resistance Wz' 3 and thus a stronger energizmg current is sent over the winding I G 1 which returns the armature to the normal osition at the end of the received current impulse. v

The arrangement has the advantage that when direct current impulses arrive over the trunk line, the resulting attractive force of the windings IGl and II G 1 exceeds that of the windings I IV 1 and II W 1, and thus the operation of the entire relay arrangement is reven'ted. The said direct current impu ses may be generated by condenser or atmospheric discharges.

What is claimed is: 1. In an impulse repeater, a relay, means in said relay for receiving a. remotely generated current impulse, means actuated by said relay for repeating said current impulse, an auxiliary winding for said relay, and means for temporarily energizing said auxiliary winding to restore said relay to normal position.

2. In an impulse repeater, a relay, a plurality of windings in said relay for receiving remotely generated current impulses, means actuated by said relay in response to said impulses for repeating said impulses to distantly located switching devices, a single auxiliary winding for said relay mounted magnetically separate from said other windings, and means for temporarily energizing said auxiliary winding to restore said relay to normal position.

3. In an impulse repeating device, a relay I having a first winding, means for actuating said relay over said first winding by remotely enerated current impulses, means actuated y said relay for repeating said impulses to distantly located switching apparatus, 1 a second winding forsaid relay, means for permanently energizing said second winding by 'a weak current, and means for momentarily energizing said second winding by a strong current impulse after the transmission of each impulse received by said first winding in order to secure its quick release.

4. In an impulse repeating device, a relay having a first winding and a second winding, means for permanently energizing said first winding in a certain manner in order to secure the normal position of said relay, means for energizing said second winding in order to'produce an operating position of said relay, and means for momentarily energizing said first winding in a different manner in order to restore said relay to normal position.

5. In an impulse receiving and repeating device, arelay, a plurality of windings for said relay for receiving remotely generated alternating current impulses, means actuated by said relay in response to said impulses for repeating said impulses to distantly located switching devices, a single auxiliary winding for said relay mounted independently and magnetically separate from said other windings and means for momentarily energizing said auxiliary winding by a direct current impulse in order to restore said relay to normal position.

'6. In an impulse repeating device, a relay having an auxiliary winding, means for energizing said winding sufiicient only to secure the normal position of said relay, an operating winding for said relay, means for energizing said operating winding in order toproduce an operated position of said relay, and means for momentarily energizing said auxiliary winding sufiiciently to restore said relay to normal position. 7. In an impulse repeating'device, a rela having an operating winding and an auxi iary winding, circuitmeans for actuating said relay over its operating winding by remotely generated current impulses, means actuated by said relay for repeating said impulses to distantly located switching apparatus and switching means for momentarily energizing said auxiliary winding 1n order to effect the restoration of said relay to normal position.

8. In an impulse receiving and repeating 1o device, a relay, a plurality of windings for said relay for receiving alternating current impulses, said relay operated responsive to I each impulse of a series for repeating said I impulses, an auxiliary winding for said relay, and means responsive to each operation of saidrelay for momentarily energizing said auxiliary winding by direct current to restore said relay to normal. v 9. In an impulse receiving and repeating device, a relay, a plurality of windings for said relay for receiving alternating current impulses, said relay operated responsive to each impulse of a series, means controlled by said relay for translating said alternating current impulses to direct current impulses, an auxiliary windinghfor said relay, and means operated responsive to each operation of said relay for momentarily energizing said relay by direct current to restore said relay :0 to normal.

10. In an impulse repeater, a relay havingan armature, biasing means in said relay for holding'said armature in an inoperated position, a pair of windings in said relay connected in multiple with each other and in series with condensers and responsive to alternating current impulses for overcoming the effect of said biasing means and moving said armature to the operated osition, means to responsive to the operation 0 said armature for repeating the impulses, and means for influencing said biasing means to return said armature to the inoperated position.

11. In an impulse repeater, a relay having 15 an armature, biasing means comprising a Winding of said relay for holding said armature in an inoperated position, a pair oi. windings in said relay connected in multiple with each other and in series withcondensers and responsive to alternating current impulses for overcoming the effect of said biaslng means and moving said armature to an operated position, means responsive to the operation of said armature for repeating the impulses, and means for momentarily energizing said biasing winding to restore said= armature to the inoperated position.

In witnesswhereof, I hereunto subscribe my name this 26th day of January, A. D.

HANS VON BECKERATH. 

